Diodorus Siculus, (flourished 1st century bc, Agyrium, Sicily) Greek historian, the author of a universal history, Bibliothēkē (“Library”; known in Latin as Bibliotheca historica), that ranged from the age of mythology to 60 bc.

Diodorus lived in the time of Julius Caesar and Augustus, and his own statements make it clear that he traveled in Egypt during 60–57 bc and spent several years in Rome. The latest event mentioned by him belongs to the year 21 bc. His history consisted of 40 books, of which 1–5 and 11–20 survive, and was divided into three parts. He outlined his plan in Book 1: Books 1–6 treat the mythic history of the non-Hellenic and Hellenic tribes to the destruction of Troy; Books 7–17 end with Alexander’s death; and Books 18–40 continue the history as far as the beginning of Caesar’s Gallic Wars. The extant Books 11–20, from the second and third parts, cover the years 480–302 bc.

The Bibliothēkē, invaluable where no other continuous historical source has survived, remedies to some extent the loss of the works of earlier authors, from which it was compiled. Diodorus does not always quote his authorities, but in the books that have survived his most important sources for Greek history were certainly Ephorus (for 480–340 bc) and Hieronymus of Cardia (for 323–302); for Roman history he was heavily dependent on Polybius (to 146) and Posidonius.

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